Pour 1 to 2 tablespoons of coconut syrup into a small cup.
Add the blue spirulina powder or food coloring. Whisk or stir well to fully dissolve and distribute the vibrant blue color.
In a glass or mason jar, add ice cubes and the blue coconut syrup. Slowly pour in the chilled lemon-lime soda and gently stir to combine.
Pop in a fun straw, and add a fun garnish. I like to add a peach ring gummy around the straw to look like a pool floatie and a gummy shark for added summer fun.